Speed up ranging in display loop

use the new `do_overlay_scaling: bool` since we know each feed will have
its own updates (cuz multiplexed by feed..) and we can avoid
ranging/scaling overlays that will make their own calls.

Also, pass in the last datum "brighter" color for ohlc curves as it was
originally (and now that we can pass that styling bit through).

piker/ui/_display.py

@@ -261,7 +261,10 @@ async def increment_history_view(
                 profiler('`hist Viz.update_graphics()` call')
 
                 if liv:
-                    hist_viz.plot.vb._set_yrange(viz=hist_viz)
+                    # hist_viz.plot.vb._set_yrange(viz=hist_viz)
+                    hist_viz.plot.vb.interact_graphics_cycle(
+                        do_overlay_scaling=False,
+                    )
                     profiler('hist chart yrange view')
 
             # check if tread-in-place view x-shift is needed
@@ -715,20 +718,18 @@ def graphics_update_cycle(
                 or not main_vb._ic.is_set()
             ):
                 yr = (mn, mx)
-                # print(
-                #     f'MAIN VIZ yrange update\n'
-                #     f'{fqsn}: {yr}'
-                # )
-
-                main_vb._set_yrange(
+                main_vb.interact_graphics_cycle(
+                    do_overlay_scaling=False,
+                )
                 # TODO: we should probably scale
                 # the view margin based on the size
                 # of the true range? This way you can
                 # slap in orders outside the current
                 # L1 (only) book range.
-                    # range_margin=0.1,
-                    yrange=yr
-                )
+                # main_vb._set_yrange(
+                #     yrange=yr
+                #     # range_margin=0.1,
+                # )
                 profiler('main vb y-autorange')
 
         # SLOW CHART resize case
@@ -1224,6 +1225,9 @@ async def display_symbol_data(
             # to avoid internal pane creation.
             # sidepane=False,
             sidepane=godwidget.search,
+            draw_kwargs={
+                'last_step_color': 'original',
+            },
         )
 
         # ensure the last datum graphic is generated
@@ -1242,6 +1246,9 @@ async def display_symbol_data(
             # in the case of history chart we explicitly set `False`
             # to avoid internal pane creation.
             sidepane=pp_pane,
+            draw_kwargs={
+                'last_step_color': 'original',
+            },
         )
         rt_viz = rt_chart.get_viz(fqsn)
         pis.setdefault(fqsn, [None, None])[0] = rt_chart.plotItem